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Tumor weights in hepatoma HepG2 xenografts. First experiment (left); second experiment (right). Control (0.9% NaCl), Photofrin (20 mg/kg); Sinoporphyrin sodium concentration: high dose groups (2 mg/kg), medium dose groups (1 mg/kg), and low dose groups (0.5 mg/kg). * p < 0.05, when compared with control groups.
